Starfire’s genesis is rather easy.
In October of 1980, Starfire originally debuted in the pages of DC Comics Presents #26. Marv Wolfman and George Pérez invented her, and she has been a key member of the Teen Titans ever since.
Coriander is the second of the Royal Family of Tamaran’s three offspring. Coriander shouldn’t have been in the position to take the kingdom after her parents died because she was the second child. Commander, her older sister, was born without the ability to fly, and as a result, she was thought unfit to govern. Coriander was treated like a princess as the next in line to the throne, whereas Komand’r was largely neglected and mistreated. This created a lot of conflict between the two sisters.
The Warlords of Okaara sent the two sisters to Warrior Training, which brought everything to a head. Komand’r devised a scheme to assassinate her sister while in training. Commander was expelled as a result of the attempted murder. She vowed vengeance on Koriand’r and the planet Tamaran in reprisal for her exile.
Komand’r betrayed her home world by divulging its defensive secrets to the Citadel, the Citadel’s sworn enemy. The Citadel easily defeated Tamaran after the truths were revealed. The condition that saw Koriand’r enslaved and never allowed to return was the most significant of the many conquering conditions. Commander was eventually revealed to be Koriand’r’s master. Koriand’r killed one of her captors after learning this. Komand’r sentenced Koriand’r to death as a result of this. Neither of them expected that they were about to be assaulted and kidnapped (for testing) by a group of scientists known as the Psions.
Komand’rs troops invaded and fought the Psions while they were being experimented on. In the middle of the chaos, Koriand’r used the new powers she had gained due to the experiments to flee. Now that she was free, she went to Earth and joined Robin and the Teen Titans under Kory Anders.